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水保局：這次不算遭土石流襲擊

Aug 31st 2013, 19:24

農委會水保局說，目前全國有一千五百多條土石流潛勢溪流，造成昨天枋山土石流的小坑溪未列其中，無法事前警戒；經現場勘查，應是上方崩落土石將靜水池及箱涵堵住，以致溢流到鐵軌造成列車出軌意外。

水保局台南分局長黃振全說，根據現場照片和水保局人員勘查研判，土砂量不大，且目前岩盤已裸露，僅須將靜水池土砂清除即可，未來不會列為土石流潛勢溪流的警戒對象。水保局長黃明耀說，這起意外不算遭土石流襲擊，土石流定義是指土石滑動下來跟著溪流滾動，台鐵列車出軌致災原因，主要是附近小坑溪的靜水池和箱涵遭崩落的土石堵住，最後溢流下來淹沒軌道，不符合土石流潛勢溪流標準。

水保局土石流防災中心主任陳美珍說，土石流必須要有三個要素，要有「料源」、「雨水」和「坡度」，料源是指溪流兩側坡地曾發生崩塌出現土砂堆積物，在雨水帶動下，順著坡度滑動進野溪中。

土石流潛勢溪流是水保局根據溪谷坡度、溪床坡度和有效集水區面積三項指標篩選出來；水保局調查，離台鐵列車出軌處最近的土石流潛勢溪流，還有三公里遠。

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